Hi,
I have a stream pipeline like this:
progress queue +---------> mapping +---------+
|
^ ^ ^ |
| | | v
| | +------------------------+ +-- merge +--->
| | | ^
| +---------+ | |
+ + + |
data +--------> stage1 +--------> stage2 +----+
- *data* is a single source that generates the data to be processed
- *progress queue* is a
Source.queue[Progress](10, OverflowStrategy.dropHead) where the progress
should be emitted
- *stage1 *and* stage2* are emitting elements to the next stage and also
the the *progress queue*
So these are actually two different data pipelines, which are only
connected by the *progress queue* and the *merge* in the end.
The initial implementation just sent messages to a progress actor, which
then send it over a play-websocket. Now I want to do this
with akka-http and the websocket describes as a Flow[Message, Message].
I read "Accessing the materialized value inside the Graph"
<http://doc.akka.io/docs/akka-stream-and-http-experimental/2.0-M1/scala/stream-graphs.html#Accessing_the_materialized_value_inside_the_Graph>,
but couldn't figure out how to implement this kind of pattern.
Thanks in advance,
Muki
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